Process and product of coating metal structures.



N.J.PORTER. PROCESS AND PRODUCT 0F COATING-METAL STRUCTURES. v

' APPLICATION FILED MAY 8.!914- v 1,289,537. Patented Dec. 31,1918.

OmFOS'L'tLOTL dompmsiw g OXL dhlor'ui b inier' fmLneral rocK as a, coai'm of 1213mm mous mLXuWe.

ATTORNEYS NORMAN JOHN PORTER, OF BELFAST, IRELAND.

, PROCESS AND PRODUCT F COATING METAL STRUCTURES.

- To all whom z'tmay concern:

'Be it known that I, NORMAN JOHN POR- TER, a subject of the King of Great Britain, residing .at Belfast, Ireland, have invented certain new and. useful Improvements Relatmg to Processes and Products of Coating Metal Structures, of which the following is a specification. 7 My invention has reference to cementitious compositions containing magnesite and magnesium chlorid or equivalent chemical binding agents for covering iron or steel or like surfaces.

It is well known compositions when applied to surfaces such as the deck plates of ships have a tendency to bulge and crack ,since they do not combine r unite with the surface of the structure and the like.

Also it is known that steel plates or the like which are covered with such compositions are subjected to thecorrosive action of moisture which finds its way under the covering and may become charged with any active chemical constituent of the same.

Such cementitious' compositions being insulating, fire resisting, and durable, their successful use as a covering for iron and steel structures and especially for ships decks is highly desirable.

The object of my invention is therefore t enable such compositions to be used for the purpose forwhich they are so highly desirable and to this end-my invention consists in interposing between the covering of such composition and the steel or like surface, a substantial layer of mineral rock asphalt which contains amajor proportion of limestone and a minor proportion of bitu men or a mixture in Which rock asphalt predominates, laid in a plastic state, and roughening the surface of the asphalt or forming in it indentations or. grooves to enable the covering composition to bond to it.

he figure represents a longitudinal section of a composition for covering iron or Specification of Letters Patent.

that such cementitious isolating the composition from its surface.

steel or like structures embodying myinvention.

tion which has the effect of assisting the asphalt to adhere to the surface. Themineral rock asphalt or mixture of the same 3' is next applied hot in a plastic state and in one or more coats to a suitable thickness.

- iron and steel Patented Dec. 31, i918.

Application filed May 8, 1914. Serial N 0. 837,207.

The surface of the asphalt is then roughened by slightly disturbing it with a suitable tool ust before it has set hard or it may have indentations or erably while it asphalt surface composition 4 is finally app state.

In practice I have found that rock asphalt belng of a gritty nature, compositions of the kind referred to above readily'combine or is still plastic, so proposed the cementitious lied in a plastic by means of a preliminary coat of bitumen or bituminous prep providing holdfasts, cleats or other fastenings, in order to attach the'covering to the structure, is avoided, and the asphalt being of a resilient nature, ency of the composition to crack, due to straining or vibration of the structures. the asphalt being non-corrosive, and impervious, effectively protects the structure against corrosion by excluding moisture and I am aware that surfaces have been cov ered with a preliminary coating of a mixture of pitch and asphaltum, or tar and asphaltum, melted and applied by a brush or mop, or in other suitable manner, to which a layer of gravel or sand has been applied, and a composition ofcement, sand, water and other ingredients is laid thereon. I amalso aware that plaster or mastic has been caused to adhere to wall covering consisting of asphaltum, coal, candle, or pinetar, or like ingredients, by incorporating into the mixture gravel, sawdust, chips, bagging 01"llk6 substances, and I know that asphalt mastic has been surfaces by applying to the surfaces a solution f bitumen or a bituminous compound in a volatile solvent and applying the mastic after the evaporation of the solvent; I do nottherefore claim any such process. I do claim as new and desire to secure by Letters Patent:

l. A process of coating and structures which comprises it reduces the tend caused to adhere to preserving aration the necessity of first applying theretoa coating of a bituminous composition, thereafter applying a' coating containing mineral rock asphalt such second coating bein applied in a hot plastic condition, and rougfiening the surface thereof before the same has set .to a hard solid, and finally applying to the roughened hardened asphalt rock coating, atop coating Whole covering firmly adhering to the metal comprising magnesite and magnesium chlostructure WithOll'O holdfasts, cleats or other,

rid, and allowing the same to set, thereby extraneous mechanical attaching means, and

forming an elastic non-corrosive resilient forming a resilient, non-corrosive and imimpervious coating capable of adhering to pervious protective covering for the metal the metal Without holdfasts, cleats or other structure.

extraneous mechanical means of attachment. In testimony whereof I affix my signature 2. A coated metal structure comprising a in presence of two Witnesses.

metal coated with a layer of bituminous NORMAN JOHN PORTER.

material, then by a roughened mass of hard Witnesses; asphalt rock, and carrying a final coating ANDREW HAMILTON, having a magnesium xychlorid binder, the HARRY WALTER ALLsoPP. 

